WO2007006863A1 - Pipe connection - Google Patents

Pipe connection Download PDF

Info

Publication number
WO2007006863A1
WO2007006863A1 PCT/FI2006/050322 FI2006050322W WO2007006863A1 WO 2007006863 A1 WO2007006863 A1 WO 2007006863A1 FI 2006050322 W FI2006050322 W FI 2006050322W WO 2007006863 A1 WO2007006863 A1 WO 2007006863A1
Authority
WO
WIPO (PCT)
Prior art keywords
clamping ring
pipe
pipe connection
larger
wall thickness
Prior art date
Application number
PCT/FI2006/050322
Other languages
French (fr)
Inventor
Jarmo Smahl
Peter Hauki
Thomas Larsson
Yngve Lundequist
Mats HÅLLEN
Original Assignee
Uponor Innovation Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=35464494&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2007006863(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to CN200680030307.XA priority Critical patent/CN101243280B/en
Priority to PL06778518T priority patent/PL1907748T3/en
Priority to US11/994,858 priority patent/US9822915B2/en
Priority to CA2614587A priority patent/CA2614587C/en
Priority to SI200631786T priority patent/SI1907748T1/en
Application filed by Uponor Innovation Ab filed Critical Uponor Innovation Ab
Priority to DK06778518.8T priority patent/DK1907748T3/en
Priority to EP06778518.8A priority patent/EP1907748B1/en
Priority to ES06778518.8T priority patent/ES2471965T3/en
Priority to EP14160196.3A priority patent/EP2775190B1/en
Publication of WO2007006863A1 publication Critical patent/WO2007006863A1/en
Priority to IL188604A priority patent/IL188604A/en
Priority to NO20080726A priority patent/NO339911B1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/20Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • F16L47/22Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics using shrink-down material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B29C65/68Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using auxiliary shrinkable elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114Single butt joints
    • B29C66/1142Single butt to butt joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52Joining tubular articles, bars or profiled elements
    • B29C66/522Joining tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0027Gate or gate mark locations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02Belling or enlarging, e.g. combined with forming a groove
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/547Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles, e.g. endless tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73715General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable heat-shrinkable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04Polymers of ethylene
    • B29K2023/06PE, i.e. polyethylene
    • B29K2023/0691PEX, i.e. crosslinked polyethylene
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10Air intakes; Induction systems
    • F02M35/1034Manufacturing and assembling intake systems
    • F02M35/10354Joining multiple sections together
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00Joints and connections
    • Y10T403/16Joints and connections with adjunctive protector, broken parts retainer, repair, assembly or disassembly feature
    • Y10T403/1616Position or guide means
    • Y10T403/1624Related to joint component

Definitions

  • the invention relates to a method and arrangement in connection with a pipe connection, a clamping ring for a pipe connection, and a pipe connection.
  • a clamping ring made of elastic material which may be the same plastic material as that from which the pipe is made, is expanded and shrunk over the pipe end, in order to further enhance the holding and sealing pressure at the pipe connection region.
  • the clamping ring is expanded at the same time as the pipe-end is expanded, with the clamping ring in position around said pipe-end.
  • Such a solution has been disclosed for example in EP 0530387.
  • the clamping ring has been made from an extruded pipe by cutting the pipe into a short enough part to form a clamping ring.
  • the pipe connection comprises a connection piece, a pipe and a clamping ring.
  • the pipe and the clamping ring are made of a material having memory properties, wherein an end of the pipe and the clamping ring have been reversibly expanded co-jointly and firmly and sealingly shrunk to the connecting piece by back shrinkage.
  • the connection piece comprises a nipple end.
  • the clamping ring is formed such that it is used for protecting the nipple end of the connecting piece.
  • the clamping ring is slipped over the nipple end during storage and transportation before the pipe connection is made. Thus the clamping ring protects the nipple end from being damaged during storage and transportation.
  • the clamping ring is made from a cross-linked polyolefin by injection molding.
  • injection molding it is possible to optimize the properties of the clamping ring for each pipe connection. For example the wall thicknesses and the design of the clamping ring can be made as per need. It is also possible to make markings into the clamping ring to give information on the clamping ring to an end user.
  • the clamping ring is formed such that the total length of a weld line / weld lines in the radial direction in the injection molded clamping ring is larger than an average wall thickness of the damping ring.
  • the clamping ring is for example formed such that at a point where the weld line resides, the wall thickness is larger than the average wall thickness.
  • Another possibility to increase the total length of the weld lines is to provide an injection molding mold into which the material is fed from two or more injection gates, such that the clamping ring comprises two or more weld lines. Also in this connection all the weld lines may be positioned such that they are formed at a position where the wall thickness is larger than the average wall thickness.
  • the weld line is the weakest spot of an injection molded particle that is made from a cross-linked polyethylene.
  • the strength of the clamping ring is increased.
  • the risk for cracks in the weld line during an expansion procedure is minimized.
  • one end of the clamping ring is provided with a stop edge. This stop edge ensures that the clamping ring remains positioned at a correct position on the pipe-end when the pipe connection is being made and after the pipe connection has been made.
  • Figure 1 schematically shows a cross-sectional side view of a pipe connection
  • Figure 2 schematically shows a cross-sectional end view of a clamping ring
  • Figure 3 shows an end view of the clamping ring as seen from an end other than that in Figure 2,
  • Figure 4 schematically shows a cross-sectional side view of a clamping ring
  • Figure 5 schematically shows a cross-sectional side view of another clamping ring.
  • Figure 1 shows a pipe 1 , which is comprised of a plastic material having memory properties, for instance a cross-linked polyethylene PEX or any other cross-linked polyolefin, and a connecting piece 2 made of metal.
  • the connecting piece 2 comprises a nipple end 3.
  • the nipple end 3 comprises radially projecting flanges 4.
  • the nipple end 3 is terminated with a radial abutment surface ⁇ .
  • the nipple end 3 has an outer diameter which exceeds the inner diameter of the unexpanded pipe 1.
  • An elastic clamping ring 6 is mounted on an end of the pipe 1. In its relaxed state, the clamping ring 6 has an inner diameter which corresponds to the outer diameter of the unexpanded pipe 1.
  • the inner surface of the clamping ring 6 is conical as shown in Figure 4.
  • This feature enables the clamping ring 6 to be positioned on the end of the pipe 1 with a tight fitting.
  • the conical shape it is easy to position the clamping ring on the end of the pipe 1 and further, because of the conical shape, the inner surface of the clamping ring 6 presses against the outer surface of the pipe 1 and the clamping ring 6 remains with a tight fitting on the end of the pipe 1.
  • the coning angle ⁇ of the inner surface of the clamping ring 6 can be in the range of O 1 1° to 2°, for example.
  • the inner surface of the clamping ring 6 can be made conical also such that first at the outer end of the clamping ring 6 there is a first larger coning angle ⁇ and thereafter a second smaller coning angle ⁇ as shown in Figure 5.
  • the first larger coning angle ⁇ provides the advantage that the positioning of the clamping ring on the end of the pipe 1 is extremely easy. Because of the second smaller coning angle ⁇ the clamping ring 6 remains with a tight fitting on the end of the pipe 1.
  • the first coning angle ⁇ can be in the range of 3° to 7° and the second coning angle ⁇ can be in the range of 0,1° to 2°, for exam- pie.
  • Figure 2 shows a cross-section of the clamping ring.
  • the material is fed into a mold.
  • the clamping ring shown in Figure 2 is made such that the mold comprises two injection gates.
  • the material is fed into the mold from each sides of the mold, which in Figure 2 is depicted with arrows.
  • the two material flows flow into the mold and they come into contact with each other. Therefore, a weld line 7 is formed at a point where the material flows unite.
  • two weld lines 7 exist in the clamping ring. If the material is fed from only one injection gate, the weld line 7 is formed substantially on the opposite side of the injection gate. Typically, no weld lines 7 can be seen in an injection molded object, but in Figure 2 the weld lines 7 have been indicated with narrow lines.
  • a weld line is the weakest spot of an injection molded ring, especially when the ring is made from a cross-linked polyolefin.
  • the total length of the weld line 7 in the radial direction is made larger than the average wall thickness of the clamping ring 6.
  • the total length of the weld lines can be made larger for example by using more than one injection gate, such that the ring comprises two or more weld lines 7.
  • the weld line can be made longer such that the wall thickness of the clamping ring is made larger at a position where the weld line resides.
  • the wall thickness at the weld line can be made larger, as is also shown in Figure 2.
  • the thicker wall at the weld line strengthens the clamping ring.
  • the diameter of the clamping ring may vary e.g. between 15 to 50 mm.
  • the length of the clamping ring 6 may be e.g. substantially equal to the diameter of the clamping ring.
  • the length of the clamping ring may also be dimensioned such that it is substantially equal to the length of the nipple end 3 of the connecting piece 2.
  • An average wall thickness of the clamping ring may vary e.g. between 2 to 6 mm.
  • the wall thickness of the clamping ring determines the contraction force of the clamping ring.
  • the wall thickness of the clamping ring is dimensioned such that the contraction force is sufficient. If the wall is made thicker at the weld line 7, the wall may be e.g. 0.3 to 2 mm thicker than the average wall thickness.
  • the clamping ring 6 is made from a cross-linked polyolefin.
  • the clamping ring may be made e.g. of a cross-finked polyethylene PEX or cross- linked polypropyien.
  • the clamping ring 6 is made from a PEX-B material, i.e. a silane PEX.
  • a PEX-B material is advantageous in connection with injection molding.
  • the stop edge ⁇ ensures that the end of the pipe 1 is at a correct position with respect to the clamping ring 6.
  • the stop edge 8 extends inwards.
  • the stop edge 8 comprises inward extending protrusions 9, which are also seen in Figure 3.
  • the protrusions 9 ensure that the pipe 1 stops at a correct position with respect to the clamping ring 6. Further, the protrusions 9 are made high enough for the clamping ring to be used for protecting the nipple end 3 of the connecting piece before the pipe connection is made.
  • the inner diameter of the clamping ring, when the clamping ring 6 is in its original form and shape, is larger than the outer diameter of the nipple end 3.
  • the protrusions are high enough to extend to a circumference that is smaller than the outer diameter of the flanges 4 of the nipple end 3.
  • the clamping ring 6 can be snapped on the nipple end 3, such that the protrusions 9 and the flange 4 hold the clamping ring 6 on the nipple end 3.
  • the clamping ring 6 protects the nipple end from being damaged, which could cause leakage problems.
  • the nipple end is not damaged.
  • the means for holding the clamping ring 6 on the nipple end 3 can be a radially inward protruding ring which has been made thin enough such that it yields when the clamping ring 6 is snapped on the nipple end 3, for example.
  • the clamping ring can be made from an extruded pipe by cutting the pipe in to a short enough part to form a clamping ring, for example. After cutting, the appropriate protrusions and other needed forms can be formed to the clamping ring by thermoforming, for example.
  • the clamping ring may e.g. comprise a hole, through which it can be detected whether the pipe is pushed correctly inside the clamping ring 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Joints With Sleeves (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

A pipe connection comprises a connecting piece (2), a pipe (1 ) and a clamping ring (6). The pipe (1) and the clamping ring (6) are made of a material having memory properties. An end of the pipe (1) and the clamping ring (6) have been reversibly expanded co-jointly and firmly and sealingly shrunk to the connecting piece (2) by back shrinkage. Preferably the clamping ring (6) is made from a cross-linked polyolefin by injection molding.

Description

Pipe connection
The invention relates to a method and arrangement in connection with a pipe connection, a clamping ring for a pipe connection, and a pipe connection.
It is known to provide a pipe connection between one end of a pipe made of a plastic material that has memory properties and a connecting piece. The memory properties mean that plastic pipes with a memory capacity automatically strive to return essentially to their original shape and form after having been expanded. For example plastic pipes that are manufactured from cross-linked polyethylene possess an active memory capacity at temperatures as low as room temperature. Pipes of this nature are joined together by widening one end of the pipe and inserting into the widened pipe-end a flanged connector which forms a part of the pipe connecting piece, normally made of metal, and which is retained in said pipe-end until the pipe has shrunk to an extent at which it is able to firmly hold the connecting piece. A clamping ring made of elastic material, which may be the same plastic material as that from which the pipe is made, is expanded and shrunk over the pipe end, in order to further enhance the holding and sealing pressure at the pipe connection region. The clamping ring is expanded at the same time as the pipe-end is expanded, with the clamping ring in position around said pipe-end. Such a solution has been disclosed for example in EP 0530387. The clamping ring has been made from an extruded pipe by cutting the pipe into a short enough part to form a clamping ring.
There is now provided an enhanced solution for making a pipe connection. This solution may be achieved by a method, an arrangement, a clamping ring and a pipe connection, which are characterized by what is disclosed in the independent claims. Some embodiments of the invention are set for the independent claims.
According to one aspect the pipe connection comprises a connection piece, a pipe and a clamping ring. The pipe and the clamping ring are made of a material having memory properties, wherein an end of the pipe and the clamping ring have been reversibly expanded co-jointly and firmly and sealingly shrunk to the connecting piece by back shrinkage. The connection piece comprises a nipple end. The clamping ring is formed such that it is used for protecting the nipple end of the connecting piece. The clamping ring is slipped over the nipple end during storage and transportation before the pipe connection is made. Thus the clamping ring protects the nipple end from being damaged during storage and transportation.
According to one embodiment the clamping ring is made from a cross-linked polyolefin by injection molding. By making the clamping rings with injection molding it is possible to optimize the properties of the clamping ring for each pipe connection. For example the wall thicknesses and the design of the clamping ring can be made as per need. It is also possible to make markings into the clamping ring to give information on the clamping ring to an end user.
According to another embodiment, the clamping ring is formed such that the total length of a weld line / weld lines in the radial direction in the injection molded clamping ring is larger than an average wall thickness of the damping ring. The clamping ring is for example formed such that at a point where the weld line resides, the wall thickness is larger than the average wall thickness. Another possibility to increase the total length of the weld lines is to provide an injection molding mold into which the material is fed from two or more injection gates, such that the clamping ring comprises two or more weld lines. Also in this connection all the weld lines may be positioned such that they are formed at a position where the wall thickness is larger than the average wall thickness. Typically, the weld line is the weakest spot of an injection molded particle that is made from a cross-linked polyethylene. However, when the total length of the weld line is larger than the average wall thickness, the strength of the clamping ring is increased. Thus, the risk for cracks in the weld line during an expansion procedure is minimized. According to yet another embodiment, one end of the clamping ring is provided with a stop edge. This stop edge ensures that the clamping ring remains positioned at a correct position on the pipe-end when the pipe connection is being made and after the pipe connection has been made.
Brief description of the figures
In the following, the invention will be described in greater detail by means of preferred embodiments with reference to the accompanying drawings, in which
Figure 1 schematically shows a cross-sectional side view of a pipe connection, Figure 2 schematically shows a cross-sectional end view of a clamping ring,
Figure 3 shows an end view of the clamping ring as seen from an end other than that in Figure 2,
Figure 4 schematically shows a cross-sectional side view of a clamping ring and
Figure 5 schematically shows a cross-sectional side view of another clamping ring.
Detailed description of the invention
Figure 1 shows a pipe 1 , which is comprised of a plastic material having memory properties, for instance a cross-linked polyethylene PEX or any other cross-linked polyolefin, and a connecting piece 2 made of metal. The connecting piece 2 comprises a nipple end 3. The nipple end 3 comprises radially projecting flanges 4. The nipple end 3 is terminated with a radial abutment surface δ.The nipple end 3 has an outer diameter which exceeds the inner diameter of the unexpanded pipe 1. An elastic clamping ring 6 is mounted on an end of the pipe 1. In its relaxed state, the clamping ring 6 has an inner diameter which corresponds to the outer diameter of the unexpanded pipe 1.
Preferably the inner surface of the clamping ring 6 is conical as shown in Figure 4. This feature enables the clamping ring 6 to be positioned on the end of the pipe 1 with a tight fitting. Thus, because of the conical shape, it is easy to position the clamping ring on the end of the pipe 1 and further, because of the conical shape, the inner surface of the clamping ring 6 presses against the outer surface of the pipe 1 and the clamping ring 6 remains with a tight fitting on the end of the pipe 1. Thus it is easy to establish the pipe connection because the risk of the clamping ring 6 to drop off from the pipe end is thus minimized. The coning angle α of the inner surface of the clamping ring 6 can be in the range of O11° to 2°, for example.
The inner surface of the clamping ring 6 can be made conical also such that first at the outer end of the clamping ring 6 there is a first larger coning angle β and thereafter a second smaller coning angle α as shown in Figure 5. The first larger coning angle β provides the advantage that the positioning of the clamping ring on the end of the pipe 1 is extremely easy. Because of the second smaller coning angle α the clamping ring 6 remains with a tight fitting on the end of the pipe 1. The first coning angle β can be in the range of 3° to 7° and the second coning angle α can be in the range of 0,1° to 2°, for exam- pie.
When establishing the pipe connection shown in Figure 1 , the end of pipe 1 and the surrounding clamping ring 6 are expanded simultaneously by an expander tool. The nipple end 3 is then immediately inserted into the end of the pipe until the abutment surface 5 is in abutment with the end of the pipe 1 and with the clamping ring 6. The end of the pipe 1 and the clamping ring 6 then shrink or contract automatically, so as to obtain a sealing contact between the inner surface of the pipe 1 and the flange 4 in particular. The sealing contact is also obtained between the inner surface of the pipe 1 and the outer surface of the nipple end 3.
Figure 2 shows a cross-section of the clamping ring. When the ring is injection molded, the material is fed into a mold. The clamping ring shown in Figure 2 is made such that the mold comprises two injection gates. Thus, the material is fed into the mold from each sides of the mold, which in Figure 2 is depicted with arrows. The two material flows flow into the mold and they come into contact with each other. Therefore, a weld line 7 is formed at a point where the material flows unite. Because in Figure 2 the material has been fed through two injection gates, two weld lines 7 exist in the clamping ring. If the material is fed from only one injection gate, the weld line 7 is formed substantially on the opposite side of the injection gate. Typically, no weld lines 7 can be seen in an injection molded object, but in Figure 2 the weld lines 7 have been indicated with narrow lines.
Typically, a weld line is the weakest spot of an injection molded ring, especially when the ring is made from a cross-linked polyolefin. However, the total length of the weld line 7 in the radial direction is made larger than the average wall thickness of the clamping ring 6. The total length of the weld lines can be made larger for example by using more than one injection gate, such that the ring comprises two or more weld lines 7.
Also, if only one injection gate is provided and, therefore, only one weld line, the weld line can be made longer such that the wall thickness of the clamping ring is made larger at a position where the weld line resides. Thus, this means that the wall of the clamping ring is at its thickest at the weld line.
Also, if several weld lines are provided, the wall thickness at the weld line can be made larger, as is also shown in Figure 2. Thus, the thicker wall at the weld line strengthens the clamping ring. Further, a mold with two or more, e.g. three or four, up to six, injection gates, gives more weld lines. When several weld lines are provided, the expansion force per one weld line is lower and thus the clamping ring is stronger.
The diameter of the clamping ring may vary e.g. between 15 to 50 mm. The length of the clamping ring 6 may be e.g. substantially equal to the diameter of the clamping ring. The length of the clamping ring may also be dimensioned such that it is substantially equal to the length of the nipple end 3 of the connecting piece 2. An average wall thickness of the clamping ring may vary e.g. between 2 to 6 mm. The wall thickness of the clamping ring determines the contraction force of the clamping ring. Thus, the wall thickness of the clamping ring is dimensioned such that the contraction force is sufficient. If the wall is made thicker at the weld line 7, the wall may be e.g. 0.3 to 2 mm thicker than the average wall thickness.
The clamping ring 6 is made from a cross-linked polyolefin. The clamping ring may be made e.g. of a cross-finked polyethylene PEX or cross- linked polypropyien. Preferably, the clamping ring 6 is made from a PEX-B material, i.e. a silane PEX. When a PEX-B material is used, cross-linking starts by the effect of heat. Therefore, a PEX-B material is advantageous in connection with injection molding.
One end of the clamping ring is provided with a stop edge 8. The stop edge δ ensures that the end of the pipe 1 is at a correct position with respect to the clamping ring 6. The stop edge 8 extends inwards. The stop edge 8 comprises inward extending protrusions 9, which are also seen in Figure 3. The protrusions 9 ensure that the pipe 1 stops at a correct position with respect to the clamping ring 6. Further, the protrusions 9 are made high enough for the clamping ring to be used for protecting the nipple end 3 of the connecting piece before the pipe connection is made. The inner diameter of the clamping ring, when the clamping ring 6 is in its original form and shape, is larger than the outer diameter of the nipple end 3. However, the protrusions are high enough to extend to a circumference that is smaller than the outer diameter of the flanges 4 of the nipple end 3. Thus, the clamping ring 6 can be snapped on the nipple end 3, such that the protrusions 9 and the flange 4 hold the clamping ring 6 on the nipple end 3. Thus, the clamping ring 6 protects the nipple end from being damaged, which could cause leakage problems. Thus, during storage and transportation the nipple end is not damaged. Instead of the protrusions 9, the means for holding the clamping ring 6 on the nipple end 3 can be a radially inward protruding ring which has been made thin enough such that it yields when the clamping ring 6 is snapped on the nipple end 3, for example.
Instead of injection molding the clamping ring can be made from an extruded pipe by cutting the pipe in to a short enough part to form a clamping ring, for example. After cutting, the appropriate protrusions and other needed forms can be formed to the clamping ring by thermoforming, for example.
In some cases the features shown in this description can be used as such irrespective of other features. Then again the features shown in this description may if necessary be combined in order to form different combinations.
It is obvious to a person skilled in the art that in the course of technical progress, the basic idea of the invention can be carried out in numerous ways. Thus, the invention and its embodiments are not limited by the previous examples, but they may vary within the scope of the appended claims. Further, the clamping ring may e.g. comprise a hole, through which it can be detected whether the pipe is pushed correctly inside the clamping ring 6.

Claims

Claims
1. A method in connection with a pipe connection which pipe connection comprises a connection piece (2) with a nipple end (3), a pipe (1), and a clamping ring (6), the pipe (1) and the clamping ring (6) being made of a material having memory properties, whereby an end of the pipe (1) and the clamping ring (6) are reversibly expanded co-jointly and firmly and sealingly shrunk to the connecting piece (2) by back shrinkage, characterized by protecting the nipple end (3) during storage and transportation with the clamping ring (6).
2. A method as claimed in claim 1, characterized by making protrusions (9) to the clamping ring (6) for holding the clamping ring (6) on the nipple end (3) by the protrusions (9).
3. A method as claimed in claims 1 or 2 characterized by making the clamping ring (6) by injection molding.
4. A method as claimed in claim 3characterized by making a total length of a weld line / weld lines (7) in a radial direction larger than an average wall thickness of the clamping ring (6).
5. A method as claimed in any one of the preceding claims, characterized by making the inner surface of the clamping ring (6) conical.
6. An arrangement in connection with a pipe connection, the pipe connection comprising a connecting piece (2) having a nipple end (3), a pipe (1) and a clamping ring (6), the pipe (1) and the clamping ring (6) being made of a material having memory properties, wherein an end of the pipe (1) and the clamping ring (6) have been reversibly expanded co-jointly and firmly and sealingly shrunk to the connecting piece by back shrinkage, characterized in that the arrangement comprises means in connection with the clamping ring (6) for holding the clamping ring (6) on the nipple end (3) for protecting the nipple end (3) during storage and transportation.
7. An arrangement as claimed in claim 6, characterized in that said means are protrusions (9) provided in the clamping ring (6).
8. An arrangement according to claims 6 or 7, characterized in that the clamping ring (6) is made from a cross-linked polyethylene by injection molding.
9. An arrangement as claimed in claim 8, characterized in that the clamping ring comprises a weld line / weld lines (7), a total length of which in a radial direction is larger than an average wall thickness of the clamping ring (6).
10. An arrangement as claimed in any one of the claims 6 to 9, characterized in that the inner surface of the clamping ring (6) is conical.
11. An arrangement as claimed in claim 10, characterized in that the conical inner surface of the clamping ring (6) is formed such that at the outer end of the clamping ring (6) there is a first larger coning angle (β) and thereafter there is a second smaller coning angle (a).
12. A clamping ring for a pipe connection, the clamping ring (6) being made from a material that has memory properties, characterized in that the clamping ring (6) is made from a cross-linked polyofefin by injection molding.
13. A clamping ring as claimed in claim 12, characterized in that the clamping ring (6) comprises a weld fine / weld lines (7), a total length of which in a radial direction is larger than an average wall thickness of the clamping ring (6).
14. A clamping ring as claimed in claim 13, characterized in that the weld line (7) is formed at a position where the wall thickness of the clamping ring is larger than the average wall thickness of the clamping ring.
15. A clamping ring as claimed in claims 13 or 14, characterized in that the clamping ring (6) is formed such that it comprises two or more weld lines (7).
16. A clamping ring as claimed in any one of the claims 12 to 13, characterized in that the clamping ring (6) at its one end comprises an inward extending stop edge (8).
17. A clamping ring as claimed in claim 16, characterized in that the stop edge (8) comprises inward extending protrusions (9).
18. A clamping ring as claimed in any one of the claims 12 to 17, characterized in that the clamping ring (6) is made from a PEX-B material.
19. A clamping ring as claimed in any one of the claims 12 to 18, characterized in that the inner surface of the clamping ring (6) is conical.
20. A clamping ring as claimed in claim 19, characterized in that the conical inner surface of the clamping ring (6) is formed such that at the outer end of the clamping ring (6) there is a first larger coning angle (β) and thereafter there is a second smaller coning angle (a).
21. A pipe connection comprising a connecting piece (2), a pipe (1 ), and a clamping ring (6), the pipe (1) and the clamping ring (6) being made of a material having memory properties, wherein an end of the pipe (1) and the clamping ring have been reversibly expanded co-jointly and firmly and seal- ingly shrunk to the connecting piece by back shrinkage, characterized in that the clamping ring (6) is made from a cross-linked polyolefin by injection molding.
22. A pipe connection as claimed in claim 21, characterized in that the clamping ring (6) comprises a weld line / weld lines (7), a total length of which is larger in a radial direction than an average wall thickness of the clamping ring (6).
23. A pipe connection as claimed in claim 22, characterized in that the weld line (7) is formed at a position where the wall thickness of the clamping ring is larger than the average wall thickness of the clamping ring.
24. A pipe connection as claimed in claims 22 or 23, characterized in that the clamping ring (6) is formed such that it comprises two or more weld lines (7).
25. A pipe connection as claimed in any one of the claims 21 to 24, characterized in that the clamping ring (6) at its one end comprises an inward extending stop edge (8).
26. A pipe connection as claimed in claim 25, characterized in that the stop edge (8) comprises inward extending protrusions (9).
27. A pipe connection as claimed in any one of the claims 21 to 26, characterized in that the clamping ring (6) is made from a PEX-B material.
28. A pipe connection as claimed in any one of the claims 21 to 27, characterized in that the inner surface of the clamping ring (6) is conical.
29. A pipe connection as claimed in claim 28, characterized in that the conical inner surface of the clamping ring (6) is formed such that at the outer end of the clamping ring (6) there is a first larger coning angle (β) and thereafter there is a second smaller coning angle (a).
PCT/FI2006/050322 2005-07-08 2006-07-07 Pipe connection WO2007006863A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
EP14160196.3A EP2775190B1 (en) 2005-07-08 2006-07-07 Pipe connection
PL06778518T PL1907748T3 (en) 2005-07-08 2006-07-07 Pipe connection
US11/994,858 US9822915B2 (en) 2005-07-08 2006-07-07 Pipe connection
CA2614587A CA2614587C (en) 2005-07-08 2006-07-07 Pipe connection
SI200631786T SI1907748T1 (en) 2005-07-08 2006-07-07 Pipe connection
CN200680030307.XA CN101243280B (en) 2005-07-08 2006-07-07 Pipe connection
DK06778518.8T DK1907748T3 (en) 2005-07-08 2006-07-07 Pipe
EP06778518.8A EP1907748B1 (en) 2005-07-08 2006-07-07 Pipe connection
ES06778518.8T ES2471965T3 (en) 2005-07-08 2006-07-07 Splice of a pipe
IL188604A IL188604A (en) 2005-07-08 2008-01-06 Clamping ring and pipe connections and methods and arrangements comprising same
NO20080726A NO339911B1 (en) 2005-07-08 2008-02-08 A tubular connector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05106243.8 2005-07-08
EP05106243A EP1741968A1 (en) 2005-07-08 2005-07-08 Clamping ring

Publications (1)

Publication Number Publication Date
WO2007006863A1 true WO2007006863A1 (en) 2007-01-18

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ID=35464494

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2006/050322 WO2007006863A1 (en) 2005-07-08 2006-07-07 Pipe connection

Country Status (14)

Country Link
US (1) US9822915B2 (en)
EP (3) EP1741968A1 (en)
CN (1) CN101243280B (en)
CA (1) CA2614587C (en)
DK (2) DK2775190T3 (en)
ES (2) ES2471965T3 (en)
FI (1) FI2775190T3 (en)
IL (1) IL188604A (en)
NO (1) NO339911B1 (en)
PL (1) PL1907748T3 (en)
PT (1) PT1907748E (en)
RU (1) RU2424463C2 (en)
SI (1) SI1907748T1 (en)
WO (1) WO2007006863A1 (en)

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WO2009004407A1 (en) * 2007-07-02 2009-01-08 Uponor Innovation Ab Method of forming a clamping ring and a clamping ring
EP2170583A1 (en) * 2007-07-02 2010-04-07 Uponor Innovation AB Method of forming a clamping ring and a clamping ring
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CN101243280A (en) 2008-08-13
EP1907748A4 (en) 2010-05-19
SI1907748T1 (en) 2014-08-29
EP1907748A1 (en) 2008-04-09
FI2775190T3 (en) 2024-05-03
PT1907748E (en) 2014-06-25
US20080315579A1 (en) 2008-12-25
EP2775190B1 (en) 2024-02-14
ES2517593T1 (en) 2014-11-03
ES2471965T3 (en) 2014-06-27
NO339911B1 (en) 2017-02-13
IL188604A0 (en) 2008-04-13
PL1907748T3 (en) 2014-08-29
DK2775190T3 (en) 2024-04-22
RU2008104778A (en) 2009-08-20
CN101243280B (en) 2014-06-04
IL188604A (en) 2010-12-30
NO20080726L (en) 2008-02-08
CA2614587C (en) 2016-11-29
CA2614587A1 (en) 2007-01-18
RU2424463C2 (en) 2011-07-20
US9822915B2 (en) 2017-11-21
EP2775190A1 (en) 2014-09-10
DK1907748T3 (en) 2014-06-10
EP1741968A1 (en) 2007-01-10
ES2517593T3 (en) 2024-09-20
EP1907748B1 (en) 2014-03-19

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